import {z} from 'zod'

export type DemRumNode = {app_id?: string | undefined, id?: string | undefined, query: string};

export type DemRumNodes = Array<DemRumNode>;

export type DemRumStepType = 'start' | 'stop' | 'step';

export type DemRumStep = {nodes: DemRumNodes, type: DemRumStepType};

export type DemRumSteps = Array<DemRumStep>;

export type DemVariantAttributes = {filter?: string | undefined, name: string, rum_steps: DemRumSteps};

export type DemVariantType = 'variants';

export type DemVariantRequestData = {attributes: DemVariantAttributes, type: DemVariantType};

export type DemVariantRequest = {data: DemVariantRequestData};

export type CreateApiApiV2DemJourneysJourneyIdVariantsArgs = {journey_id: string, body: DemVariantRequest};

export type CreateApiApiV2DemJourneysJourneyIdVariantsOptions = {baseUrl?: string | undefined, apiKeyAuth?: string | undefined, appKeyAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const demRumNode = z.object({app_id: z.string().optional(), id: z.string().optional(), query: z.string()});

export const demRumNodes = z.array(demRumNode);

export const demRumStepType = z.enum(["start", "stop", "step"]);

export const demRumStep = z.object({nodes: demRumNodes, type: demRumStepType});

export const demRumSteps = z.array(demRumStep);

export const demVariantAttributes = z.object({filter: z.string().optional(), name: z.string(), rum_steps: demRumSteps});

export const demVariantType = z.literal("variants");

export const demVariantResponseData = z.object({attributes: demVariantAttributes, id: z.string(), type: demVariantType});

export const demVariantResponse = z.object({data: demVariantResponseData});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * Create a DEM journey variant
 * 
 * POST /api/v2/dem/journeys/{journey_id}/variants
 * 
 * Also accepts auth: AuthZ
 */
export const createApiApiV2DemJourneysJourneyIdVariants = async (args: CreateApiApiV2DemJourneysJourneyIdVariantsArgs, options?: CreateApiApiV2DemJourneysJourneyIdVariantsOptions) => {
const {baseUrl = "https://api.datadoghq.com", fetch: fetchFn = fetch, apiKeyAuth, appKeyAuth} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('content-type', "application/json")
headers.set('accept', "application/json")

if (apiKeyAuth !== undefined) headers.set("DD-API-KEY", apiKeyAuth)
if (appKeyAuth !== undefined) headers.set("DD-APPLICATION-KEY", appKeyAuth)

const url = `${baseUrl.replace(/\/+$/, '')}/api/v2/dem/journeys/${encodeURIComponent(String(args.journey_id))}/variants${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(demVariantResponse, await res.json())
};